Move DataBuffer / DataExtractor and friends from Core -> Utility.

llvm-svn: 296943

1 files changed, 52 insertions, 0 deletions

diff --git a/lldb/source/Utility/DataBufferLLVM.cpp b/lldb/source/Utility/DataBufferLLVM.cpp
new file mode 100644
index 00000000000..2f6654d4c9a
--- /dev/null
+++ b/lldb/source/Utility/DataBufferLLVM.cpp
@@ -0,0 +1,52 @@
+//===--- DataBufferLLVM.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Utility/DataBufferLLVM.h"
+
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace lldb_private;
+
+DataBufferLLVM::DataBufferLLVM(std::unique_ptr<llvm::MemoryBuffer> MemBuffer)
+    : Buffer(std::move(MemBuffer)) {
+  assert(Buffer != nullptr &&
+         "Cannot construct a DataBufferLLVM with a null buffer");
+}
+
+DataBufferLLVM::~DataBufferLLVM() {}
+
+std::shared_ptr<DataBufferLLVM>
+DataBufferLLVM::CreateFromPath(const llvm::Twine &Path, uint64_t Size,
+                               uint64_t Offset) {
+  // If the file resides non-locally, pass the volatile flag so that we don't
+  // mmap it.
+  bool Volatile = !llvm::sys::fs::is_local(Path);
+
+  auto Buffer = llvm::MemoryBuffer::getFileSlice(Path, Size, Offset, Volatile);
+  if (!Buffer)
+    return nullptr;
+  return std::shared_ptr<DataBufferLLVM>(
+      new DataBufferLLVM(std::move(*Buffer)));
+}
+
+uint8_t *DataBufferLLVM::GetBytes() {
+  return const_cast<uint8_t *>(GetBuffer());
+}
+
+const uint8_t *DataBufferLLVM::GetBytes() const { return GetBuffer(); }
+
+lldb::offset_t DataBufferLLVM::GetByteSize() const {
+  return Buffer->getBufferSize();
+}
+
+const uint8_t *DataBufferLLVM::GetBuffer() const {
+  return reinterpret_cast<const uint8_t *>(Buffer->getBufferStart());
+}